Boiler and boiler-furnace



(No Model.)

W. BRAND. BOILER AND BOILER FURNACE.

Patented 00927 UL ZHH L UNITED STATES PATENT OFFIC WILLIAM BRAND, oF PITTsBURc, PENNSYLVANIA.

BOILER AND- BOILER-FURNACE.

SPECIFICATION forming part of Letters Patent No. 569,996, dated October 27, 1896.

Application filed January 23, 1896. Serial No. 576,487. (No model.) I

T0 at whom it may concern:

Be it known that I, WILLIAM BRAND, a resident of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Boilers and Boiler-Furnaces and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to boilers and boilerfurnaces, its object being to create an active circulation and at the same time to provide a boiler-furnace in which a thorough combustion takes place.

To enable others skilled in the art to make and use my invention, I will describe the same more fully, referring to the accompanying drawings in which- Figure 1 is a longitudinal section of a boiler and furnace embodying my invention. Fig; 2 is a like view of the invention as applied to a smoke-flue boiler. Fig. 3 is a sect-ion on the line 3 3, Fig. 1; and Fig. 4 is asection on the line 4 4:, Fig. 2.

Like letters indicate like parts in each of the figures.

My invention is applicable to many forms of boilers, and I have illustratedit as applied to both the common form of water-tube boiler and smoke-flue boiler.

Figs. 1 and 3 represent my invention as applied to the water-tube boiler. This boiler is in principal features a Babcock and WVilcox boiler, consisting of the drum a and the inclined water-tubes I), connected to the headers c 0. These headers c c are in communication with the drum Ct through the pipes cl d. The mud-drum'e is located at the lower end of the header 0 in the ordinary manner. The baffle-walls f g it cause the heated products to pass in an indirect course up and down through the tubes 1') on their way to the stack or chimney, so that the tubes 1) are all highly heated by said products of combustion. All these parts are contained within the furnace t', which is provided with the ordinary charging and cleaning doors, &c.

At the front of the furnace t is the fuelchamber 7t, provided with the grate'bars Z. Beyond the grate-bars Z is the bridge-wallm, said bridge-wall having the passage m formed therein, communicating with the furnacechamber at the upper end thereof. The lower end of the passage m is in communication with the flue n, which extends to the rear end of the furnace, where it communicates with the open air. In this manner air is emitted from the upper end of the bridge-wall m to commingle with the products of combustion as they come from the fuel-chamber 70. Beyond the bridge-wall m is the rear bridgewall 0, the space between the two walls forming the combustion-chamber p.

The rear bridge-wall 0 willnow be described in detail. It consists of the brick foundation 0 with the arched openings 0 therein, through which the flue n passes. Supported on this foundation 0 is the water-chamber q, constructed of sheet metal of proper thickness. The said waterchamber q may be formed in any suitable manner to give it the requisite strength, and is provided with the stay-bolts q. The water-cham ber q is further supported by fitting its ends within recesses formed to receive it in the walls of the furnace. The baffle-wall 9 extends up from the bridge-wall 0. Leading from one side of the water-chamber q, at the upper end thereof, is the pipe 0, said pipe extending upwardly and forwardly to the front end of the furnacechamber, where it connects with the header 0 at r. This pipe rbeing within the furnacechamberand at the forward or hottest part ,of said chamber is of course subjected to a high heat and will serve as an uptake-pipe. The second pipe 3 leads from the lower end of the water-chamber q directly back to the header 0, entering said header at s. I do not limit myself, however, to the above-described arrangements of the pipes r and s, as they may be arranged in different Ways according to the circumstances. Nor do I limit myself to the use of two pipes, as the number may be increased.

Between the two bridge-walls m and o is the depending wall t, which also consists of the water-chamber t, constructed like the waterchamber g. This wall t issupported within recesses in the sides of the furnace and so forms an extension of the downwardly-projecting baftle-Wallf. Leading from the upper end of the water-chamber t is the pipe to, said pipe extending up within the furnace-chamber to the header 0 of the boiler, which it enters at it. This pipe also is an uptake-pipe,

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as it is exposed to the high heat of the front part of the furnace. Leading from the lower end of the water-chamber i is the pipe 15*, which passes down through the furnace to the header 0, which it enters at a This arrangement of the pipes '16 and 11 may also be varied to suit circumstances.

hen the invention is applied to the type of boilers shown in Fig. 1, the heated products of combustion coming from the fuel-chamber strike the baffle f and depending wall 25, by which they are carried down into the combustion chamber 1). A fresh supply of air is added to the heated products as they pass down into the combustion chamber. The gases and air become highly heated by contact with the heated surfaces both of the firechamber m and depending wall 0, and as they unite with each other form a very high heat within the combustion chamber 19. The heated products then pass up from the combustion-chamber p in between the tubes 1), and thence are directed down between the tubes again by the rear baiile h. The tubes Z) are thus, of course, highly heated and at the same time the depending wall 2 and bridgewall 0.

The main circulation in the boiler after it has become heated properly is from the drum (1, down the pipe cl to the header 0, thence up through the tubes 1) to the header 0, and thence by the pipe (1 back into the drum (L. This circulation is kept up constantly while the furnace is in operation. Besides this main circulation there are two additional circulations through the water-chambers q and t. The water will pass from the header 0 through the pipe s to the water-chamber q and from the water-chamber g by the uptake-pipe 0' into the header 0, and thence to the drum Ct. The other circulation is from the header 0, through the pipe M to the Water-chamber t, and thence by the pipe 2b to the header 0. In this man ner therear bridge-wall 0 and depending wall t not only act to create a greater heat under the boiler with less fuel, but by forming the water-chambers in them I obtain two additional circulations, so that the efficiency of the boiler is greatly increased, While the circ ulation throughout is made more active, which prevents the accumulation of scale.

. Figs. 2 and 4 show the invention as applied to a common form of smoke-flue boiler, and as the operation is the same as described with reference to Figs. 1 and 3 no detailed description is deemed necessary.

By the use of my invention I am enabled to create a circulation in an ordinary smoke-flue boiler.

Vhat I claim as my invention, and desire to secure by Letters Patent, is-

In a boiler-furnace, the combination with a boiler of a fuel-chamber at the front end thereof having a bridge-wall, a bridge-wall in the rear of said first-mentioned wall having a water-chamber therein, a depending wall between said bridge-walls having a water-chainber therein, and circulating-pipes connecting said water-chambers to the boiler, substantially as set forth.

In testimony whereof I, the said \VILLIAM BRAND, have hereunto set my hand.

XVILLIAM BRAND.

Witnesses:

ROBT. D. TOTTEN, ROBERT C. TOTTEN. 

